Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-23-149921-index-headers.html | 2023-05-22 08:00:31 | |
| 0001193125-23-149921-index.html | 2023-05-22 08:00:31 | |
| 0001193125-23-149921.txt | 2023-05-22 08:00:31 | |
 0001193125-23-149921-xbrl.zip | 69935 | 2023-05-22 08:00:31 |
| atha-20230518.xsd | 2835 | 2023-05-22 08:00:31 |
| atha-20230518_lab.xml | 18737 | 2023-05-22 08:00:31 |
| atha-20230518_pre.xml | 11697 | 2023-05-22 08:00:31 |
| d457287d8k.htm | 59460 | 2023-05-22 08:00:31 |
| d457287d8k_htm.xml | 3471 | 2023-05-22 08:00:31 |
| d457287dex101.htm | 25597 | 2023-05-22 08:00:31 |
| d457287dex102.htm | 57715 | 2023-05-22 08:00:31 |
| d457287dex103.htm | 162489 | 2023-05-22 08:00:31 |
| d457287dex991.htm | 10909 | 2023-05-22 08:00:31 |
| FilingSummary.xml | 1831 | 2023-05-22 08:00:31 |
| Financial_Report.xlsx | 5749 | 2023-05-22 08:00:31 |
 g457287g0518234809183.jpg | 2565 | 2023-05-22 08:00:31 |
 g457287g95x76.jpg | 11199 | 2023-05-22 08:00:31 |
| MetaLinks.json | 19607 | 2023-05-22 08:00:31 |
| R1.htm | 41378 | 2023-05-22 08:00:31 |
| report.css | 2767 | 2023-05-22 08:00:31 |
| Show.js | 1085 | 2023-05-22 08:00:31 |